{"product_id":"oppo-reno6-4g-replacement-battery-387v-4200mah-li-polymer","title":"Oppo Reno6 4G BLP819 Compatible Battery 3.87V 4200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOppo Reno6 4G \/ Reno 5Z 5G — 3.87V Li-Polymer Replacement Battery (BLP819)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe BLP819 is a 3.87V, 4200mAh (16.25Wh) Li-Polymer cell that fits the Oppo Reno6 4G (CPH2235) and Reno 5Z 5G 2021 (CPH2211). It replaces the internal battery when the original cell can no longer hold a usable charge or causes unexpected shutdowns. Capacity figure is taken directly from the product specification — no rounding, no inflation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCPH2235 and CPH2211 platform fit:\u003c\/strong\u003e\n    Both models share the BLP819 footprint — same 86.40 × 62.90 × 5.00 mm envelope, same flex connector pinout, and compatible BMS handshake with the PMIC on each board. The cell slots without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a CPH2235 unit and monitored BMS communication through full charge and discharge. The protection circuit triggered correctly at the low-voltage cutoff and the charge IC accepted both standard and VOOC charge sessions without fault codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after installation:\u003c\/strong\u003e\n    On first use after fitting, disable fast charging and run one complete discharge-charge cycle at standard rate. This gives the fuel gauge IC a clean discharge curve to map against the new cell before VOOC pushes high current into an uncalibrated coulomb counter.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Reno6 4G reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the CPH2235 board stores a learned discharge curve from the original cell. When you install a new BLP819, that stored curve no longer matches the new cell's actual voltage profile. The IC interpolates percentage from voltage points calibrated to the old, degraded cell — so it reads too high or too low until it relearns. One full slow-charge cycle, starting from below 10%, forces the coulomb counter to reset its endpoint references against the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the display or modem draws a high current burst and the cell voltage sags below the BMS cutoff threshold — even though the gauge still reads 20% or higher. It is a calibration gap, not a faulty cell. The fuel gauge IC assigned that percentage to a voltage point the old cell could sustain, but the new cell's internal resistance profile is different. Run the recalibration cycle described above; after one full slow discharge to shutdown and a complete recharge, the gauge maps the correct voltage-to-percentage relationship and the early cutoff stops.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391817875546,"sku":"BWCS-ORP223SL-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391817908314,"sku":"BWCS-ORP223SL-2","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391817941082,"sku":"BWCS-ORP223SL-3","price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ORP223SL-1.webp?v=1779142282","url":"https:\/\/batteryweb.com\/products\/oppo-reno6-4g-replacement-battery-387v-4200mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}